<?php
/*
TODO :
- factorize the annotation system
- factorize to adapter : Format, Bridge, Cache (actually code is almost the same)
- implement annotation cache for entrance page
- Cache : I think logic must be change as least to avoid to reconvert object from json in FileCache case.
- add namespace to avoid futur problem ?
- see FIXME mentions in the code
- implement header('X-Cached-Version: '.date(DATE_ATOM, filemtime($cachefile)));
*/

//define('PROXY_URL', 'tcp://192.168.0.0:28');

date_default_timezone_set('UTC');
error_reporting(0);

/*
  Create a file named 'DEBUG' for enabling debug mode.
  For further security, you may put whitelisted IP addresses
  in the 'DEBUG' file, one IP per line. Empty file allows anyone (!).
  Debugging allows displaying PHP error messages and bypasses the cache: this can allow a malicious
  client to retrieve data about your server and hammer a provider throught your rss-bridge instance.
*/
if (file_exists('DEBUG')) {
    $debug_enabled = true;
    $debug_whitelist = trim(file_get_contents('DEBUG'));
    if (strlen($debug_whitelist) > 0) {
        $debug_enabled = false;
        foreach (explode("\n", $debug_whitelist) as $allowed_ip) {
            if (trim($allowed_ip) === $_SERVER['REMOTE_ADDR']) {
                $debug_enabled = true;
                break;
            }
        }
    }
    if ($debug_enabled) {
        ini_set('display_errors', '1');
        error_reporting(E_ALL);
        define('DEBUG', 'true');
    }
}

require_once __DIR__ . '/lib/RssBridge.php';

// extensions check
if (!extension_loaded('openssl'))
	die('"openssl" extension not loaded. Please check "php.ini"');

// FIXME : beta test UA spoofing, please report any blacklisting by PHP-fopen-unfriendly websites
ini_set('user_agent', 'Mozilla/5.0 (X11; Linux x86_64; rv:30.0) Gecko/20121202 Firefox/30.0 (rss-bridge/0.1; +https://github.com/sebsauvage/rss-bridge)');

// default whitelist
$whitelist_file = './whitelist.txt';
$whitelist_default = array(
	"BandcampBridge",
	"CryptomeBridge",
	"DansTonChatBridge",
	"DuckDuckGoBridge",
	"FacebookBridge",
	"FlickrExploreBridge",
	"GooglePlusPostBridge",
	"GoogleSearchBridge",
	"IdenticaBridge",
	"InstagramBridge",
	"OpenClassroomsBridge",
	"PinterestBridge",
	"ScmbBridge",
	"TwitterBridge",
	"WikipediaBridge",
	"YoutubeBridge");

if (!file_exists($whitelist_file)) {
	$whitelist_selection = $whitelist_default;
	$whitelist_write = implode("\n", $whitelist_default);
	file_put_contents($whitelist_file, $whitelist_write);
}
else {
	$whitelist_selection = explode("\n", file_get_contents($whitelist_file));
}

Cache::purge();

try{

    Bridge::setDir(__DIR__ . '/bridges/');
    Format::setDir(__DIR__ . '/formats/');
    Cache::setDir(__DIR__ . '/caches/');

    if( isset($_REQUEST) && isset($_REQUEST['action']) ){
        switch($_REQUEST['action']){
            case 'display':
                if( isset($_REQUEST['bridge']) ){
                    unset($_REQUEST['action']);
                    $bridge = $_REQUEST['bridge'];
                    unset($_REQUEST['bridge']);
                    $format = $_REQUEST['format'];
                    unset($_REQUEST['format']);

			// whitelist control
			if(!Bridge::isWhitelisted($whitelist_selection, $bridge)) {
				throw new \HttpException('This bridge is not whitelisted', 401);
				die; 
			}

                    $cache = Cache::create('FileCache');

                    // Data retrieval
                    $bridge = Bridge::create($bridge);
                    if(defined("DEBUG")) {
                    } else {
                        $bridge->setCache($cache); // just add disable cache to your query to disable caching
                    }
					$bridge->loadMetadatas();
                    $bridge->setDatas($_REQUEST);
                    // Data transformation
                    try {
		                $format = Format::create($format);
		                $format
		                    ->setDatas($bridge->getDatas())
		                    ->setExtraInfos(array(
		                        'name' => $bridge->getName(),
		                        'uri' => $bridge->getURI(),
		                    ))
		                    ->display();
		            } catch(Exception $e) {

						echo "The brige has crashed. You should report this to the bridges maintainer";

		            }
                    die;
                }
                break;
        }
    }
}
catch(HttpException $e){
    header('HTTP/1.1 ' . $e->getCode() . ' ' . Http::getMessageForCode($e->getCode()));
    header('Content-Type: text/plain');
    die($e->getMessage());
}
catch(\Exception $e){
    die($e->getMessage());
}

$formats = Format::searchInformation();

?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Rss-bridge" />
    <title>RSS-Bridge</title>
    <link href="css/style.css" rel="stylesheet">
</head>

<body>

    <header>
        <h1>RSS-Bridge</h1>
        <h2>·Reconnecting the Web·</h2>
    </header>
	<?php
	    $activeFoundBridgeCount = 0;
		$showInactive = isset($_REQUEST['show_inactive']) && $_REQUEST['show_inactive'] == 1;
		$inactiveBridges = '';
		$bridgeList = Bridge::listBridges();
	    foreach($bridgeList as $bridgeName)
	    {
			if(Bridge::isWhitelisted($whitelist_selection, $bridgeName))
			{
				echo HTMLUtils::displayBridgeCard($bridgeName, $formats);
	            		$activeFoundBridgeCount++;
			}
			elseif ($showInactive)
			{
				// inactive bridges
				$inactiveBridges .= HTMLUtils::displayBridgeCard($bridgeName, $formats, false) . PHP_EOL;
			}
		}
		echo $inactiveBridges;
	?>
    <section>
        <a href="https://github.com/sebsauvage/rss-bridge">RSS-Bridge alpha 0.2 ~ Public Domain</a><br />
		<?= $activeFoundBridgeCount; ?>/<?= count($bridgeList) ?> active bridges. <br />
        <?php
            if($activeFoundBridgeCount !== count($bridgeList)){
                // FIXME: This should be done in pure CSS
                if(!$showInactive)
                    echo '<a href="?show_inactive=1"><button class="small">Show inactive bridges</button></a><br />';
                else
                    echo '<a href="?show_inactive=0"><button class="small">Hide inactive bridges</button></a><br />';
            }
        ?>
    </section>
    </body>
</html>